Upper left corner Between Dicta Striker and Orfevre's nameplates Behind the cat throne on Yayoi's head Above Tosen Jordan's head On Machitan's right arm On the armrest of Yayoi's throne Both of Yukino's eyes Next to Kitasan's armpit Next to Bakushin's armpit Behind the 秋 kanji in Yayoi's nameplate
Can't find it now, but I vaguely recall seeing this in a doujin with the caption "Let's Ask Master Rin!" If so, it was probably a joke on Ask Dr. Rin, which was an unrelated anime.
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